Benjamin Santos Abalos Sr. (born September 21, 1934) is a Filipino politician who currently serves as the mayor of Mandaluyong, Metro Manila since 2022, a position he also held from 1986 to 1987 and from 1988 to 1998.

In 1986, shortly after Marcos was ousted through a popular uprising, President Corazon Aquino appointed him as Officer-in-Charge (OIC) of the then municipality of Mandaluyong.

He was re-elected two times in the elections of 1992 and 1995, making him one of the two Aquino OIC appointees who survived and secured the constitution-mandated three consecutive terms limit for local officials.

Abalos made Mandaluyong's cityhood in 1994, also witnessing economic growth brought about by the establishment of new shopping malls and Marketplace, the country's first build-operate-and-transfer and build-transfer (BOT-BT) project.

Upon being term-limited in 1998, Abalos ran for congressman of the lone district of Mandaluyong but lost to incumbent Neptali Gonzales II.

On January 20, 2001, Abalos was appointed chairman of the Metropolitan Manila Development Authority, a post he held until the following year.

[citation needed] On October 1, 2007, Abalos resigned during a press conference; and Resurreccion Borra would be appointed Acting Chairman.

[9] On September 27, 2007, Iloilo Vice Governor Rolex Suplico filed a 64-page impeachment complaint against Abalos, in his capacity as Commission on Elections Chairman, before the House of Representatives of the Philippines regarding the NBN–ZTE deal corruption scandal.

[19] CaloocanAlong Malapitan(NP)ManilaHoney Lacuna(Asenso Manileño/Lakas)PasayEmi Rubiano(PFP)TaguigLani Cayetano(NP) Las PiñasImelda Aguilar(NPC)MarikinaMarcelino Teodoro(NUP)PasigVico Sotto(Independent/Giting ng Pasig)ValenzuelaWes Gatchalian(NPC) MakatiAbigail Binay(MKTZNU/NPC)MuntinlupaRuffy Biazon(One Muntinlupa)PaterosIke Ponce(Aksyon) MalabonJeannie Sandoval(NP)NavotasJohn Rey Tiangco(Navoteño)Quezon CityJoy Belmonte(SBP) MandaluyongBenjamin Abalos(PFP)ParañaqueEric Olivarez(Lakas)San JuanFrancis Zamora(PFP)